So I'm fiddling around in piano roll, and I noticed that for some reason, the notes...how do I put it...they're kind of...sliding around everywhere? Um...hang on...

Here's what happened before when I clicked on one of the little squares and added notes:

http://i50.tinypic.com/b3neaf.jpg

Now here's what's started happening:

http://i49.tinypic.com/2d8ggv6.jpg

Note how the notes aren't...erm..."lined up" in the little squares and the like. They're kind of...half in and half out of the "sections." Have I turned something by mistake, or something?